WATER TREATMENT CARTRIDGE SHUTOFF

摘要

A shutoff may comprise an engine for moving from a first position to a second position, and a casing for containing the engine. The shutoff may also comprise a valve. The engine may comprise a highly water swellable material. The casing may comprise at least one flow port. The engine may expand from said first position to said second position after a predetermined amount of time when contacted with water. The flow port may become at least substantially blocked, directly or indirectly, by the engine when the engine is in said second position. The engine may be used in a water treatment cartridge, and/or may be used to indicate the life status of a water treatment cartridge.